The main problem with being a "back-door man" (in the original, Delta blues connotation, natch), is the psycho husbands you may rub the wrong way. Decorum is doubly important when you drive a fine car like, say, this formerly mint BMW M3. Don't forget, husbands keep plenty of tools (and paint) in their workshops for — if no other reason — taking the occasional scalawag to task.
sleeping with someone's ex = Vandalized m3 [Club4ag]
Related:
Wife Sells Cheating Arsehole s Lotus for Half-Quid [internal]